No Power at Distribution box

No power at black box by battery, fuses I J and K are not getting power. All fuses in car are checked and double checked. 89 s/c 5 speed ran one day and now won't start,, getting spark but no fuel. 12 volts at fuel relay and only 3 volts at enertia switch.. Where does the distribtuin get its power from and what has to happen for it to get energized ?????? thanks

If I remember correctly the (+) battery cable goes connected to the starter relay, and from that same post on the relay a cable goes inside the black fuse box. The only thing i can think of is to disassemble the black fuse box and check the inline fuses with a test light. I hope this helps...

Main fuse

I think there may be a main fuse near the dist box.
See pic. That may be blown.
Bill